ASNT NDT Level III PT Practice Questions - ASNT NDT Level III Liquid Penetrant Testing (PT) Exam

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Two penetrants have similar viscosity and dye load, but Penetrant A has higher surface tension than Penetrant B. Assuming both wet the surface equally well, which penetrant should provide stronger capillary pull into a very tight crack, all else being equal?

Penetrant B, because lower surface tension always means stronger capillary action Penetrant A, because higher surface tension increases the capillary driving force when wetting is good Neither, surface tension does not affect capillary action Both equally, since they have the same viscosity

Correct Answer:

Penetrant A, because higher surface tension increases the capillary driving force when wetting is good

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